3.7.21. Write the negation of the following statements without using the negation symbol . Also, for each statement, decide whether it is true or false. Explain your answer briefly. (a) (Vr E R)(3y E R)(x² > y²) (b) (3z € Z) [(2² = (x+ 1)*) = (2³ € Z)] ©2017 Shay Fuchs. All rights reserved. 79 3.7. EXERCISES FOR CHAPTER 3 CHAPTER 3. INFORMAL LOGIC (c) (Vn E N)[(n – 1)* + n° # (n + 1)*] (d) [( E R)(r > 0)) = [(Vx € R)(x = 1+1)| (e) (Vz € R)( (z² < -1) = [(x + 1)² = x? + 1]] (f) (V ER)(x > 0) = (3n e N)(n- r > 1)| (g) (Vz ER)(3y E R(r + y)² = a² + y²) (h) (3y E R)(Vx E R)(r+ yl a|+ lul) (i) (Vz E Q)(3n E N)(n zE Z) G) (Vz ER)(Vy ER) (((+y S 7) A (ry r)) = (x< 7)| 3.7.22. For each statement below, write it and its negation using the logic symbols. Make sure to simplify

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3.7.21 Parts b)e)j)
3.7.21. Write the negation of the following statements without using the negation symbol .
Also, for each statement, decide whether it is true or false. Explain your answer briefly.
(a) (Vz E R)(3y ER)(x² > y²)
(b) (3z € Z) [(z² = (x+ 1)*) = (2³ € Z)]
©2017 Shay Fuchs. All rights reserved.
79
3.7. EXERCISES FOR CHAPTER 3
CHAPTER 3. INFORMAL LOGIC
(c) (Vn E N)[(n – 1)* + n° # (n + 1)*]
(d) [(Vz E R)(r > 0)] → [(Vx € R)(x = x + 1)|
(e) (Vz E R)( (z < -1) = [(x + 1)² = x? + 1]]
(f) (Vz ER)(r > 0) = (3n e N)(n- r > 1)|
(g) (Vz ER)(3y E R(r +y)² = x² + y²]
(h) (3y E R)(Vx E R)(r+ yl |a|+ lul)
(i) (Vz EQ)(3rn E N)(n zE Z)
G) (Vz ER)(Vy ER) (((+yS 7) A (ry= r)) = (r<7)|
3.7.22. For each statement below, write it and its negation using the logic symbols. Make sure to simplify
Transcribed Image Text:3.7.21. Write the negation of the following statements without using the negation symbol . Also, for each statement, decide whether it is true or false. Explain your answer briefly. (a) (Vz E R)(3y ER)(x² > y²) (b) (3z € Z) [(z² = (x+ 1)*) = (2³ € Z)] ©2017 Shay Fuchs. All rights reserved. 79 3.7. EXERCISES FOR CHAPTER 3 CHAPTER 3. INFORMAL LOGIC (c) (Vn E N)[(n – 1)* + n° # (n + 1)*] (d) [(Vz E R)(r > 0)] → [(Vx € R)(x = x + 1)| (e) (Vz E R)( (z < -1) = [(x + 1)² = x? + 1]] (f) (Vz ER)(r > 0) = (3n e N)(n- r > 1)| (g) (Vz ER)(3y E R(r +y)² = x² + y²] (h) (3y E R)(Vx E R)(r+ yl |a|+ lul) (i) (Vz EQ)(3rn E N)(n zE Z) G) (Vz ER)(Vy ER) (((+yS 7) A (ry= r)) = (r<7)| 3.7.22. For each statement below, write it and its negation using the logic symbols. Make sure to simplify
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